Domestic sewage treatment method

Abstract

The invention discloses a domestic sewage treatment method. The domestic sewage treatment method comprises the following steps: domestic sewage is pumped into an anoxic tank for a biochemical reaction, suspended pollutants and soluble organic matters in the sewage are hydrolyzed into organic acid, macromolecular organic matters are decomposed into micromolecular organic matters, insoluble organic matters are converted into the soluble organic matters, and an anoxic hydrolysis product is obtained; the anoxic hydrolysis product is subjected to denitrification treatment through organic carbon in the sewage; the anoxic hydrolysis product after denitrification is pumped into an aerobic tank for aerobic treatment, and the organic pollutants are further removed; the sewage after biochemical treatment is separated by a filter membrane, suspended matters are removed, microbes in the sewage are intercepted, and concentrated water and purified water are obtained; the concentrated water flows back to the aerobic tank, and higher microbe concentration and longer sludge age of the aerobic tank are maintained; the purified water is pumped to a drain tank and drained up to the standard. According to the method, the equipment size can be reduced, the use cost can be reduced, cleaning is convenient, and sludge bulking is prevented.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a domestic sewage treatment method. Background technique [0002] Due to the absence of an independent sludge return system in existing sewage treatment equipment, sludge with unique functions cannot be cultivated, and the degradation rate of refractory substances is low; and the secondary sedimentation tank in the A / O process occupies a large area, When the internal circulation is high, the operating cost is high, the sludge age is short, and problems such as sludge bulking are prone to occur. The high sludge output makes the generated activated sludge easy to cause secondary pollution and the treatment cost is high. [0003] In view of the above-mentioned defects, the designer is actively researching and innovating in order to create a domestic sewage treatment method to make it more industrially useful. Contents of the invention [0004] In order to solve the above technical pro...

AI Technical Summary

Problems solved by technology

[0002] Due to the absence of an independent sludge return system in existing sewage treatment equipment, sludge with unique functions cannot be cultivated, and the degradation rate of refractory substances is low; and the secondary sedimentation tank in the A / O process occupies a large area, When the internal circulation is high, the operating cost is high, the sludge age is short, and problems such as sludge bulking are prone to occur. The high sludge output makes the generated activated sludge easy to cause secondary pollution, and the treatment cost is high.